Question

How will you prove that lights travel in a straight line ?​

Answer 1

Answer:

Light travels in straight lines.

Shadows are evidence of light travelling in straight lines. An object blocks light so that it can't reach the surface where we see the shadow. Light fills up all of the space before it hits the object, but the whole region between the object and the surface is in shadow.

Answer 2

Answer:

take a bulb and light it

see it from a straight pipe

you will be able to see it when you see it from a bend pipe you will no longer see it

this proves that light travels in a straight line

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